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Old 08-05-2012   #1 (permalink)
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2002 Civic overheating

Hi all!

It's kind of weird what is happening to my car... A while ago I had noticed that I ran out of a coolant because of a leak - fixed. After that the car has started overheating when not moving after driving few miles. So I changed the thermostat, replaced the coolant and got rid of air bubbles from the radiator (jack stand the car, open the radiator cap, heating to the max, and run it like this for 25 minutes, than close the radiator cap and shut the engin off). What I noticed is when the temperature rises above the half of the gauge scale, the fan is not working... I have to run AC to make it work. Then the temperature goes down. Sometimes the fan starts when the temperature is below the middle range of the temperature scale, but once it's above I have not noticed it working.
How should I proceed with this problem, should I change the temperature sensor which is located by the thermostat, or should I do something else?
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Old 08-05-2012   #2 (permalink)
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Re: 2002 Civic overheating

Attachment 83826
Quote:
Originally Posted by Marcins83 View Post
Hi all!

It's kind of weird what is happening to my car... A while ago I had noticed that I ran out of a coolant because of a leak - fixed. After that the car has started overheating when not moving after driving few miles. So I changed the thermostat, replaced the coolant and got rid of air bubbles from the radiator (jack stand the car, open the radiator cap, heating to the max, and run it like this for 25 minutes, than close the radiator cap and shut the engin off). What I noticed is when the temperature rises above the half of the gauge scale, the fan is not working... I have to run AC to make it work. Then the temperature goes down. Sometimes the fan starts when the temperature is below the middle range of the temperature scale, but once it's above I have not noticed it working.
How should I proceed with this problem, should I change the temperature sensor which is located by the thermostat, or should I do something else?
What fan is not working? The radiator fan? You have a condenser fan and a radiator fan. Jumper battery power to the fan not working or jumper the radiator or condenser fan relay, whichever applies, so there's 12VDC available at the suspected bad fan connector.

Below is the honda service manual check for the fan motors. Says to basically hook each fan to the batter and see if they run. (A) terminal is on the left and (B) is on the right if you're looking at the fan jack.

Cooling System

Fan Motor Test

10-6


  1. Disconnect the 2P connectors from the radiator fan motor and condenser fan motor.
Terminal side of male terminals


Click the image to open in full size.
  1. Test the motor by connecting battery power to the B terminal and ground to the A terminal.
  2. If the motor fails to run or does not run smoothly, replace it.
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Old 08-06-2012   #3 (permalink)
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Re: 2002 Civic overheating

Quote:
Originally Posted by Matt_75 View Post
Attachment 83826

What fan is not working? The radiator fan? You have a condenser fan and a radiator fan. Jumper battery power to the fan not working or jumper the radiator or condenser fan relay, whichever applies, so there's 12VDC available at the suspected bad fan connector.

Below is the honda service manual check for the fan motors. Says to basically hook each fan to the batter and see if they run. (A) terminal is on the left and (B) is on the right if you're looking at the fan jack.

Cooling System

Fan Motor Test

10-6
  1. Disconnect the 2P connectors from the radiator fan motor and condenser fan
Terminal side of male terminals


Click the image to open in full size.
  1. Test the motor by connecting battery power to the B terminal and ground to the A terminal.
  2. If the motor fails to run or does not run smoothly, replace it.
It looks like the fan switch is not working properly. I have checked the relay by disconecting the cables from a fun switch and conecting the two cables together with a paper clip. The fan started working right away. Tomorrow I'll replace the switch and post pictures. Thank you for the answer.
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Old 08-06-2012   #4 (permalink)
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Re: 2002 Civic overheating

Quote:
Originally Posted by Marcins83 View Post
Thank you for the answer.
You're welcome. Glad you found the problem.
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Old 08-07-2012   #5 (permalink)
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Re: 2002 Civic overheating

I will replace the coolant again after installing the new fan switch. I found the description of how to bleed the radiator:
"Turn the heater controls to highest temp setting and defrost mode (if equipped with a/c)....remove the radiator cap on a cold engine and open the bleeder screw a couple turns ...located in the thermostat housing or upper radiator hose.....add a 50/50 mix of coolant/water to the rad until it gets to the top and comes out the bleeder screw. Close the bleeder and start the engine.....add 50/50 mix if and when the coolant level goes down in the radiator....when warmed up, open the bleeder screw and allow any air to escape until just coolant comes out...use a rag to catch any drips. Close the bleeder when just coolant comes out and top off the radiator....fill up the overflow tank as well if it is low. Stop the engine and replace the rad cap...restart and run the engine for a bit....move the heater controls though the range of temps....allow the engine to reach normal operating temp and make sure the temps don't fluctuate..(if you have a temp gauge)

Parking the vehicle on an incline with the front end higher helps...the point is to make the radiator the highest point in the cooling system...many modern cars have lower hoodlines which make the engine heads or heater core the highest point which can trap air pockets.. You may have to repeat bleeding a couple times with a cold and hot engine cycle to get all the air out....on some car models you have to remove one of the heater hoses briefly to allow air to escape...or install a flush tee with a cap that can be removed briefly to allow air to escape ."

Can somebody explain where is the bleeder screw, where is it located?
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Old 08-08-2012   #6 (permalink)
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Re: 2002 Civic overheating

Hi All, I'm relatively new out here and have what I hope is a simple question. My daughter's '02 is pushing coolant back into the reservoir and out the overflow. After some reading and many tests, I believe she has a head gasket leaking or a warped block.

My question is this, there are all manner of snake oil products claiming to seal these kinds of leaks. Do any of them work?

The symptoms are constantly losing coolant (albeit slowly) and eventually, overheating on longer drives. She's carrying pre-mix coolant and tops off the radiator before driving any reasonable distances.

I would like to limp the car along a little longer but really don't want to spend $1,500 on it. It's got 170K miles.

Advice?
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Old 08-11-2012   #7 (permalink)
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Re: 2002 Civic overheating

Sorry buddy but I have no idea... I am also new and still struggling with my overheating issue... Below is the description what I have done:

1. As you can read from my post below, first thing I have changed was the thermostat. The car was still overheating when on idle. I had to be in a constant move to keep the temperature in a right level.

2. After driving couple miles I noticed, that (when the AC was off) the fan would not start when the temperature gauge pointer was a in a middle of its scale, so I decided to change the fan radiator switch. I thought that might be the problem. Ewerything was ok when driving short distances... But the car was still overheating.

3. I decided to flush the radiator coolant. After that I have replaced thermostat again and refilled with new coolant.

So the following is happening after this change: car is not overheating when on idle ( when I first start engin). It can stay like this for a longtime time, the fan starts automatically when the engin temperature is little below its middle position. Looks like everything works fine so I took it for a 20 miles ride... When I stopped the temperature was little above the middle of the scale and the fan started working, but it started running just for a short while! It has not been running until the temperature went below the middle (when on idle). So the temperature started rising, I had to turn my car off to not overheat it...

There is no white smoke from my exhaust. I really have no idea what is the reason of the overheating... May be the temperature sensor is bad???? May be the pipe???? Is there a way to check it? What I also noticed is that my coolant was red when when drained out and. Please help me...

Btw I have noticed when I turn the key in my dashboard, but the car is still off, the engine sign stay still but right before it goes off it flashes 5 times. During a ride it is not on, not flushing. Any ideas???

Last edited by Marcins83; 08-12-2012 at 08:27 AM.
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Old 09-28-2012   #8 (permalink)
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Re: 2002 Civic overheating

So my Civic started over heating out of no where. Never smokes or anything like that the temp just goes all the way to hot after running fine all day. I replaced the thermostat but still having the same issue. If I turn the heater all the way on it goes back down to normal. Anyone have an idea of what I should do next? Sorr Im new at this and any help would be great thanks!
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Old 09-30-2012   #9 (permalink)
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Re: 2002 Civic overheating

leave the heavy stuff like the gasket for last, but there are tons of other stuff to look for in this links.

Overheating common causes - reference

g'luck
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